How do I get geolocation in openweather API

How do I get mu openweather API to work with geolocation? This is my current html code:

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/bootstrap.css">
        <link rel="stylesheet" href="main.css">
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
        <script type='text/javascript' src='app.js'></script>
    </head>
    <body>
        <div class="jumbotron">
            <button onclick="getLocation()">Get my location.</button>
            <p id="demo"></p>

            <script>
                var x = document.getElementById("demo");
                function getLocation() {
                    if (navigator.geolocation) {
                        navigator.geolocation.getCurrentPosition(showPosition);
                    } else { 
                        x.innerHTML = "Geolocation is not supported by this browser.";
                    }
                }

                function showPosition(position) {
                    x.innerHTML = "Latitude: " + position.coords.latitude + 
                                  "<br>Longitude: " + position.coords.longitude;    
                }
            </script>

            <p>The weather outside is: </p> 
            <div class= "weather">
                Oops.. there is no temperature available for your location right now.
            </div>
        </div>                                  
    </body>
</html>

And my JavaScript code:

$(document).ready(function(){
    $.getJSON( "http://api.openweathermap.org/data/2.5/weather?q=Eindhoven&appid=9334f947893792dcb9b2e2c05ae23eb0", function( data ) {
        $('.weather').html(Math.round(data.main.temp-273)+ ' degrees Celcius');
    });

});

I got the weather in Eindhoven city working, but I want to be able to adjust it to the latitude and longitude. Can someone fix my code for me? And help me?

I know it has something to do with this link: api.openweathermap.org/data/2.5/weather?lat={lat}&lon={lon} but I don't know how to implement my own fount latitude and longitude in it...

You can get data about the location with use third-party API, for example: http://ip-api.com/

var getIP = 'http://ip-api.com/json/';
$.getJSON(getIP).done(function(location) {
    console.log(location)
})

Next get WeatherData from OpenWeatherMap service using the ip-api that we got above

var getIP = 'http://ip-api.com/json/';
var openWeatherMap = 'http://api.openweathermap.org/data/2.5/weather'
$.getJSON(getIP).done(function(location) {
    $.getJSON(openWeatherMap, {
        lat: location.lat,
        lon: location.lon,
        units: 'metric',
        APPID: 'APIKEY'
    }).done(function(weather) {
        console.log(weather)
    })
})

In this case, the celsius temperature (metric)

Or using HTML5 Geolocation API (in Google Chrome work only with HTTPS or on localhost)

var openWeatherMap = 'http://api.openweathermap.org/data/2.5/weather'
if (window.navigator && window.navigator.geolocation) {
    window.navigator.geolocation.getCurrentPosition(function(position) {
        $.getJSON(openWeatherMap, {
            lat: position.coords.latitude,
            lon: position.coords.longitude,
            units: 'metric',
            APPID: 'APIKEY'
        }).done(function(weather) {
            console.log(weather)
        })
    })
}